LWIS: Show address range of enrolled buffers

- use scnprintf instead of snprintf

example:
Enrolled buffers:
[ 0] FD: 182 Mode: w Addr:[0x00000000f78ff000 ~ 0x00000000f78fffff] Size: 4096
[ 1] FD: 233 Mode: w Addr:[0x00000000d6d00000 ~ 0x00000000d6dfbfff] Size: 1032192
[ 2] FD: 228 Mode: w Addr:[0x00000000e8300000 ~ 0x00000000e83fbfff] Size: 1032192
[ 3] FD: 160 Mode: w Addr:[0x00000000fe300000 ~ 0x00000000fe3fbfff] Size: 1032192
[ 4] FD: 229 Mode: w Addr:[0x00000000e84fb000 ~ 0x00000000e84fbfff] Size: 4096
[ 5] FD: 168 Mode: w Addr:[0x00000000fcf00000 ~ 0x00000000fcffbfff] Size: 1032192
[ 6] FD: 218 Mode: w Addr:[0x00000000e7fff000 ~ 0x00000000e7ffffff] Size: 4096

Bug: 171267231
Test: Logs, CTS
Signed-off-by: Nick Chung <nickchung@google.com>
Change-Id: I4ec2b2a2ab047e3518abd56dff6e10862def16a0